C4 Flashcards

1
Q

Why does pure water not conduct electricity?

A

It contains very few ions

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2
Q

Why can metals be bent and shaped?

A

Their atoms are arranged in layers which slide over each other

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3
Q

What type of forces hold an ionic lattice together?

A

Electrostatic forces

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4
Q

What is the shape of a nanotube?

A

Cylindrical

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5
Q

What is an alloy?

A

A mixture of 2 or more elements, where at least 1 is a metal

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6
Q

What is a limiting reactant?

A

The limiting reactant (or limiting reagent) is the reactant that gets consumed first in a chemical reaction and therefore limits how much product can be formed.

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7
Q

What is a covalent bond?

A

A bond which is formed when two atoms share a pair of electrons

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8
Q

What explains why substances made of small molecules cannot conduct electricity?

A

They have no charged particles that are free to move from place to place

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9
Q

Name the type of bonding in a molecule of water

A

Covalent bonding

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10
Q

How to calculate gas volume?

A

Volume = amount in mol × molar volume

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11
Q

How are the atoms arranged in a metal?

A

In layers

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12
Q

Give 2 reasons why percentage yield is less than 100

A
  • incomplete reaction
  • loss of sample during recovery
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13
Q

Formula of buckministerfullerene

A

C60

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14
Q

Formula for moles

A

Moles = Mass / Mr

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15
Q

Formula for mass

A

Mass = Moles x Mr

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16
Q

Formula for concentration (g/dm^3)

A

Concentration = mass / volume

17
Q

Formula for atom economy

A

Atom Economy = (Mr of desired products / Mr of all reactants ) x 100

18
Q

Example of an alloy

A

Steel, brass